<template>
  <div class="alert">
    <div class="alert-main" v-if="!notices.length">
      <div class="alert-content"><slot></slot></div>
    </div>
    <div v-else class="alert-main" v-for="item in notices" :key="item.name">
      <div class="alert-content">{{ item.notice }}</div>
    </div>
  </div>
</template>

<script>
let seed = 0;
function getUuid() {
  return "alert_" + seed++;
}
export default {
  name: "VueAlert",
  data() {
    return {
      notices: [],
    };
  },
  methods: {
    add(notice) {
      const name = getUuid();
      let _notice = Object.assign(
        {
          name: name,
        },
        notice
      );
      this.notices.push(_notice);
      // 定时移除
      const duration = notice.duration;
      setTimeout(() => {
        this.remove(name);
      }, duration * 1000);
    },
  },
  remove(name) {
    const notices = this.notices;
    for (let i = 0; i < notices.length; i++) {
      this.notices.split(i, 1);
      break;
    }
  },
};
</script>

<style lang="less">
.alert {
  position: fixed;
  width: 100%;
  top: 36px;
  left: 0;
  z-index: 1000;
  text-align: center;
  pointer-events: none;
}
.alert-content {
  display: inline-block;
  padding: 8px 16px;
  background: lightblue;
  border:1px solid blue ;
  border-radius: 3px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.2);
  margin-bottom: 8px;
}
</style>